interface

问题 I decided to add a tap interface and use it in my code , but I am able to get its state UP. sudo ip -f link tuntap add tap10 mode tap sudo ip link set tap10 up After this when I do "ip link" tap10: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN qlen 500 link/ether 26:cc:d2:b4:37:ea brd ff:ff:ff:ff:ff:ff state DOWN: How to get this state UP ? I am trying to send packets to it and nothing is received . 回答1: It turns out that you need to have a proccess that uses your

问题 The compiler won't permit me to keep <X,Y> on the last line and I do not understand why. How do I get such a generic construction to compile? I tried changing the code to this: X a = new A<X,Y>(); // "Type mismatch: cannot convert from A<X,Y> to X" Y b = new B<X,Y>(); // "Type mismatch: cannot convert from B<X,Y> to Y" W<X,Y> s = new M<X,Y>(a,b); // no error I am a bit lost - please help! 回答1: The constructor of M< X, Y > expects to receive an X and a Y , but you're trying to give it an IA< X

问题 I'm wondering what the general recommendation would be (attribute, interface, abstract class, or combination thereof) for the following implementation: /// <summary> /// Loads class specific information into a list for serialization. The class must extend PlugIn. /// The filenames parameter is passed from a FileDialog. /// </summary> /// <param name="filenames">Accepts any number of filenames with fully qualified paths.</param> public static void ExtractPlugInData(params string[] filenames) {

问题 Implementing Interface just provide the skeleton of the method. If we know the exact signature line of that method, in this case what is the requirement to implement Interface? This is the case in which Interface has been implemented interface IMy { void X(); } public class My:IMy { public void X() { Console.WriteLine("Interface is implemented"); } } This is the case in which Interface has not been implemented public class My { public void X() { Console.WriteLine("No Interface is implemented

问题 I have a fragment, where I have a button to choose an image from a gallery. The gallery is open successfully, but when I choose the image, I do not get the result from activity. So I consider to use a callback (interface). However, I do know how. Could you suggest me something please? interface public interface CallbackListener { void onPhotoTake(String url); } in fragment click @OnClick(R.id.addPhoto) void photo() { if (isStoragePermissionGranted()) { Intent i = new Intent(Intent.ACTION_PICK

问题 This question already has answers here : When defining a Windows API interface in C#, do I have to define all members? Can I only define the methods I'm going to use? (2 answers) Closed 3 years ago . I'm trying to display a standard open file dialog that can select folders, using the IFileOpenDialog interface in C#, Visual Studio 2010. I'm trying to use the minimal code, so I've only defined the methods I need in the interfaces: using System; using System.Runtime.CompilerServices; using

问题 What is different between an abstract and an Interface class in C#? 回答1: An interface is not a class , it is just a contract that defines the public members that a class must implement. An abstract class is just a class from which you cannot create an instance. Normally you would use it to define a base class that defines some virtual methods for derived classes to implement. 回答2: Rather than writing whole thing here.. try http://www.codeproject.com/KB/cs/abstractsvsinterfaces.aspx 回答3: A

问题 I have two Java class hierarchies that share a common ancestor and implement a common interface. I need to pass a pointer to one of these things to a method in another class. interface I { ... } class A extends java.awt.Component implements I { ... } class B extends java.awt.Component implements I { ... } class D { Component c; I i; void m(? x) { c = (Component) x; i = (I) x; } } Is there something I can replace the ' ? ' with that will allow me pass in either an ' A ' or a ' B '? If I cast '

问题 I would like to disable the Action Center messages in Windows. I know where the registry holds the values for these checks but those are machine specific. And I know that I can disable the complete service. But I do not want to disable the service, I only want to not show the notifications/alerts/messages. To see these options I am talking about goto: cmd.exe -> RunDll32.exe shell32.dll,Control_RunDLL wscui.cpl The security center will be started and click on the left on "Change Action Center

问题 As the title suggest what is the difference between the three and when should one use one of the three instead of the other two? The internet is filled with their definition but i couldn't find any text or explanation on when and where to use required interface or the <<use>> dependency. 回答1: There are only two cases in fact: realize/use on the one hand, and provided/required on the other. They essentially describe the same thing, but with different emphasis. With realize/use you draw visible